net/mlx5/windows: fix match criteria in flow creation

net/mlx5/windows: fix match criteria in flow creation

Currently the Windows implementation hardcodes match criteria to
MLX5_MATCH_OUTER_HEADERS when creating flow rules, which prevents
matching on inner headers and other criteria types like NVGRE.

The fix uses the matcher's match_criteria_enable attribute instead
of hardcoding OUTER_HEADERS, and moves the assignment outside the
action switch block to apply to all cases.

NVGRE item type is also added to the supported items list.

Fixes: 1d194496b9d1 ("net/mlx5: create flow rule on Windows")
Cc: stable@dpdk.org
Signed-off-by: Itai Sharoni <isharoni@nvidia.com>
Acked-by: Bing Zhao <bingz@nvidia.com>